Thong tin khoa hgc cdng nghg m o
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/NGHIEN cOtJ THIET KE CONG NGHE KHAI THAC
flP DUNG DIEU KHIEN Df^ V(iCH BRNG CHEN LO THOY UTC CHO DIEU KIEN VIA 9B, KHU VUC CANH NAM, MO THAN MAO KHE
According to the evaluation of the geological conditions and coal reserves at Canh Nam area of Mao Khe coal mine, the coal reserves under the surface objects and building constructions needed to be protected is about 23,2 million tons, accounting 31% of the total geological re- serves to the level of-400. Using this coal reserves as coal ribs has been considered as the natural resources loss.
Therefore, study on the proper technological solutions for maximally mining the above mentioned coal reserves and ensunng the safety of the surface objects and building con- structions needed to be protected is most necessary
1. Dat vin de
K i t qua dinh g l i dieu kien dia chit v l ting hpp tru" lyong khu canh Nam, md M?o Khe [1]
cho t h i y trir lypng than nam dydi c i c cdng trinh, dii typng c i n bao ve tren be mat khu vyc (khdng tinh trii' lypng n i m trong tru bao vp cic phay pha, dirt gay cdng trinh gilng v l sln^ga gilng) khoang 23,2 trieu tan, chilm 3 1 % tong trir lypng dia chit tinh den mirc -400. Trong dd, trO' lypng than n i m dydi cac cong trinh dyang dien cao the chilm ty le 59%, ho chira nydc 14%, khu dan c u - 1 1 % , moong lp_thien cii - 7%
va c i c suoi - 9% ( hlnh 1). Viec d l lal trir lupng than n i y lam tru bao vp se gay lang phi tai nguyen lan v l lim giam hieu qua dau t y khai thang, ma via ctia cic dy an mo. Do dd, v i n de nghien cu-u giai phap cdng nghe phii hap, vira khai thic dypc toi da t i l nguyen than ndi tren, vira dam bao an t o i n cho c i c cdng tnnh, doi typng tren b l mat dia hlnh la hit su'c c i n thilt.
Nham glai quyet v i n d l niy, nam 2011, Cdng ty than Mpo Khd da phoi hop vol Vipn Khoa hpc Ccng nghe IVI6 thye hien Be t i l "Nghien ciru glai phip c6ng nghe khai thac via day, doc canh Nam - C6ng ty than tJlao KhS", va da dupc Hpi ding KHCN Tap d p i n Cdng nghiep Than - Khping s i n Vi$t Nam nghipm thu (2013). B l t i l d l d l xuit c i c sa a l ccng nghe (SfiCN) khai thic dilu khiln d l vIch bang phyang phap
TS. TRyONG eOc Dy TS. [£ £>(!C N G U Y E N TS PHAM TRUNG NGUYEN Vidn Khoa hoc Cdng nghe Mo - Vinacomin
ThS. NGUYEN VAN T U A N ThS NGUYEN ANH T U A N Cdns fy than Mao Khe - TKV Bien tap: TS. TrwoTig DCpc Dw
Khu dan cu-, 11%
Lo cu,' moong Iq thien
Ccic ho nirdc, 14%
suoi, 9%
Hlnh 1. Phdn bd trU luang than dudi cdc cdng trinh, ddi tirang bi mat khu cdnh Nam md Mao Khe
CM^u diy via.
Hlnh 2 Phdn loai trO luang than theo cdc yiu td chiiu ddy, gdc ddc via
chen id phii hpp vdi dilu kien d|a chit ky thuat mc khu vyc cinh Nam, md Mao Khe (via d i y trung binh d i n day, doc tren 45°), (hlnh 2). D l
KHCNM S 6 10/2014* CNKT H A M L 6
Thong tin khoa hoc cong nghe mo
CO cc so* danh gia kha nang ap dung va mirc dp anh hu'dng den be mat dat cua cong nghe de xuat trong dieu kien thirc t^, Cong ty than Mao Khe va Vi$n Khoa hpc Cong nghe Mo da ti^p tgc phol hpp lua chon va lap Phu'cmg an ap dung thu" nghiem cong nghe tgi vfa 9b khu Tay Nam, mu-c -80/LV, trinh Tap doan Cong nghiep Than - Khoang san Viet Nam xem xet cho phep trien khai cac cong viec tiep theo.
Do day la loai hinh eong nghe mo'i, du'p'c ap dyng thi> nghiem l^n dau, nen viec thi&t k§ cac giai phap cong nghe can du'pc luan giai khoa hpc bang ly thuyet va thye nghiem. Bai bao trinh bay mpt s6 ket qua nghien CLTU thiet k^ eae giai phap eong ngh? cua Phu-cng an cho dieu kien cu t h i khu VLTC dy kien ap dung thCr nghiem.
2. Dac digm khu virc ap dung thip nghiem va Iva chpn SOON khai thac
Khu vyc dy kiln ap dung thu" nghiem tai vfa 9b, khu Tay Nam, mirc -80/LV, phia Dong giap ranh gidi try bao ve suoi Binh Minh, phia Tay la ranh gipi khu vyc khai thac eu. B§ mat dia hinh la khu vyc trong trai, dan cu' da du'pc di rdi, eho phep thilt lap mgng lu'di quan trac theo dai dieh chuyen, biln dang be mat dat trong qua trinh khai thac thu" nghiem cong nghe. Khu vyc co vj tri thuan \(?'\ cho vi$c cung cap dien, nu'dc va cac nguyen vat lipu khac phyc vu 16 chg thu' nghipm.
Trong gidi han khu vyc, via 9b co hu'dng cam Nam - Tay Nam, goc die vfa thay doi tir 60 - 75°, trung binh 65°, chilu day via thay doi tCr 3,8 - 9,5m, trung binh 6,9m. Via than co eau tao phdc tgp, trong vfa eo t d 0 - 3 Idp da kep, chieu day
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v; /^4-.£->l ,^ /f ^^1^
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a i kep thay doi tir 0 * 2,94m, thinh phin chu yeu la set kit. D l vach tryc tiep I I set k i t phan Id'p mong tir 0,2 + 0,4m, chieu d i y lop 1,0 + 4,0m. Ben tren lap set k i t I I Id'p b i t k i t ran chae, cd chilu day thay a l l tir 23 * 30m. D l tnj tn,fc tilp la lap set ket c6 chieu day thay d i i tir 1,0 •«•
3,0m, t i l p theo la Id'p bpt k i t ran chae, chilu day tir 20 + 25m. T i n g trii' lypng dja chat huy dpng I1100.000 tan.
Tren co sd' phan tich dieu kipn i^a chit ? kJ thuat mo khu vyc I p dung thir nghi$m v l dinh g i l c i c yu, nhyac diem cua mOt so SDCN khai thac dyac de xuit, Phyang an da lya chpn ap dung SBCN khai t h i c cpt d i i thep hud'ng doc, chia top ngang nghieng thep trinh t y tir dypi ien, khiu than bang khoan no min, dieu khien da vIch bang chen 16 t o i n p h i n theo phyang phap thiiy lyc SDCN khai thao dypc the hipn tren hinh 3.
Sa d l khai thdng chuin bj cua khu vyc dupc thye hipn nhy sau: Mirc thing gid ±0 dypc khai thdng bang cup xuyen via (1) a trung tam khu vyc. IVIiro van tai -80 dypc khai thdng bang cac cup xuyen via (3), (3') v l 16 dpc via (4), (4'), (4'').
Tai v| tri trung tam khu vyc, dap thypng thdng gid (2) bam try tir id dpc via (4') len ciip xuyin via (1), chia khu vyc khai thac thinh hai canh Ddng, Tiy. Tir Id xuyen via (3) v l Id dpc via (4") d i p hpng sap rdt than (5) v l thypng v|n tai than (6") mirc -80/-70. Dao Id dpc via v | n tai (8) mii'c -70 bam tru tir hpng s l o (5) d i n thypng v|n tai (6"). Dao d o thypng thoat nyd'c (6) va (6'), M l cup n i l (7) tir Id dpc via (8) b i m tru sang 16
3 n ^^
MATCATI-I WATCATI
\il '\12' \i ' \ u \u \ i AS Hinh 3. SDCN khai thSc chia lOp ngang nghieng, khiu than vS chdn Id theo trinh ti/ tCe du^i ISn
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thypng thong gio (2) bam vach, day la 16 c i t ban 6ku md gucng khai th^c.
Cdng tac khai thac chia Idp ngang nghieng k i t hpp vdi chen 16 toan phan theo trinh t y t d du-di len, chieu cao m6i Idp bang 2,2m. Trong m6i Idp, vipc khai thac du'p'c t i l n hanh nhu- sau:
Md 16 khdi diem (12) cua Idp khiu, n6i giOa 16 dpc via van tai bam tm (11) va 16 thu'p'ng thong gio bam vach (2). Td 16 khdi diem bat mep md gu-cng khiu (14) v l bien gidi hai canh Dong, Tay. Khiu gu'cng bang cong nghe khoan no min, ch6ng gid 16 chp bang vi chong g6. Trong qua trinh khai thac va chen 16 mdi Idp, chong gid hinh thanh 16 dpc v\a thong gio (13), day dong thdi se la 16 dpc via van tai khi khai thac ldp tilp theo. L6 dpc via van tai (11) mit di theo tiln dp khiu gu-ang.
C6ng tac chen 16 bang phu-cng phap thuy lye du'pc tiln hanh theo tiln dp 6m (6 luong khau).
Khi khiu gu'cng 16 chp den bu'dc chen 16, ddng eong tac khiu chong guang de tien hanh chen 16. Cong tae ehuan bj bao gom chong tang eudnghinh thanh 16 dpc via thong gio (13), dong banh g5 lam c6p pha cho khoi chen, nii dai ong dan vgt lipu chen den vj trf can chen 16. Vat lipu chen du'pc chuin bj ngoai mpt bang va van chuyin bang sdc nu'dc trong he thong dudng Ing qua cup xuyen via (1), thupng thong gio (2) vao thi eong khii chen. Trong qua trinh chen 16 m5i Idp, ching gid hinh thanh cac thupng van tai (10), (10') va thu-png thoat nude (9), (9') trong khii chen.
Than khai thac d gu-o-ng 16 che dupc van tai bang m^ng trupl xuing mang cao d 16 dpc via van tai (11) cua Idp va du'p'c do xuong cac thupng van tai (10) (10'), sau do, qua cup xuyen via (3) ho|ic 16 dpc via (4") roi dua ra ngoai.
Thong gi6 b i n g ha ap chung cua mo, gi6 sach t d cac dudng 16 (3) va (4") theo cac thuang (10), (10"), 16 dpc via (11) vap thong gi6 eho guang 16 chp hai canh. Gio thai t d guang 16 chp theo 16 dpc via thong gio (13), thuang thong gio (2) tho^t ra ngoSi qua cup xuyen via (1).
Nudc trong qua trinh chen 16 thim qua khoi ch6n chay v^o e^c thupng tho^t nudc (9) va (9'), r i i theo c^e rSnh thoat nudc d mdc -80 v l h i m thu nudc, sau do Cwtyc bam quy hoi len tren b l chda d$t tai m$t bing +25.
3. Nghien ci^u thiet ke cac giai phap cong nghe chen 16
Tren ea sd SDCN khai thae dup'c lya ehpn, Phuang an da xay dung phuang phap luan va tinh toan, thilt k l cac giai phap cong nghe cho dilu kien khu vyc ap dung thu nghiem. Trong d6, dang luu y la cac giai phap v l cong nghe chen 16 nhu: lua chpn, gia cong vat lieu chen;
van ehuyin vat lieu chen; va cac giai phap c l p - thoat nudc.
3.1. Nghien c i k / lira chgn vat lieu chen Id phu hffp
Vat lieu su dung de chen l i p khoang khong gian da khai thac phai dap dng cac yeu cau nhu:
la vat lieu re tien hoac co san, co nguon cung dam bao d l giam t i i da chi phi chen 16; khong dupc ehda cac chit doc hai gay 6 nhiim m6i trudng nudc hoac khong khi trong khu vyc khai thac, va khong c6 tinh t u chay; co tinh an m6n thip d i i vdi phuang tien vgn tai chiing nhu dudng ong, bang tai hay may chen 16; khong dinh ket, von eye khi bao quan. Ngoai ra, dii vdi phuang phap chen 16 thuy lyc, vat lieu chen 16 can CO ham luang set khong vupt qua 10% (dl tranh t i e dudng ong va thao kho khii chen tit), va c6 ty le thanh phin cd hat phu hap. Cd hpt vat lieu Chen 16 thuy luc thudng khong Idn han 60mm Theo kinh nghipm cua nhieu mo ham 16 tai Nga, Ba Lan, cd hat vat lieu chen thudng d mde thip, t d 10 ^ 30mm hoac nho han. Ty Ip thanh phin cac hat co kich thudc Idn va nho trong vat lieu chen can tuan theo ty Ip ve he s i dong d i u N = deo/dio > 5. Trong do, deo; dio- Oudng kinh 16 sang dam bao tuang dng 60% va 10% khii lupng vat lieu Ipt qua. Trong thye t l , cac vat lieu t y nhien thudng it khi thoa man tat ca cac yeu cau noi tren, do vay, vpt lipu chen 16 thudng duac gia cong bing each nghiin, sang va tron l i n cac loai vat lipu khac nhau d l tao dupc h i n hpp vat lieu chen dpt yeu c i u .
Tai khu vyc Mao Khe, mpt s i loai vat lieu eo t h i dup'c xem xet su dung d l chen 16 la: cat s6ng, da thai t u qua trinh dao 16, xit thai td eae xudng tuyen than, tro xi tu nha may nhipt dipn trong khu vye.
Cat CO nhung dac dilm nhu chiu dupc ap suit cao, CO kieh thudc hpt nho, ding nhit, tinh chat t h i m thIu t i t , thoat nudc nhanh, khong
KHCNM S 6 1(1/2014* CNKT HAM L 6
w
Thong tin khoa hoc cong nghe mo tryang no ngam nyd'c, v l cc tinh tra cap, la loai v|t lieu sach, khdng gay 6 nhilm nguon nyd'c.Do dd, c i t r i t phii hpp trpng viec sir dgng l i m v l t lipu chen 16, dac biet vai phyang phip chen 16 thuy lyc. Tuy nhien, hien nay nguon cung c l p c i t cho Mao Khe chu y l u tir cac khu vyc ngoii nhy Uong Bi, Kinh lydn - Hai Dypng vd'i g i l thanh khoang 240 + 260 nghin dong/m^ Do dd, vipc sil' dung cat lim v|t lipu chen 16 chp khu vyc thir nghiem chya that sy hpp ly d' thirl dilm hipn tai do ngudn cung c l p khdng cd san v l cung khdng re.
D l thai d i e 16II nguIn vat lieu s i n c6 tai md.
Qua khao sat cho thiy, hing nam lypng d l thai tir c i c gyang d i o 16 d l cua Mao Khe khoang 130.000 t i n , duac d l ra cac bai thai tai V6, V7, V8, cinh Nam. Ba t h i l cd cd' hat lan (100 -^
300mm), thinh phin chu yeu la bot kit, c i t k i t typng d i i cu'ng (f = 6 + 10), ty le set v l than thip, cd the sir dung lim v l t lieu chen. Viec chen Id bang d l thai khdng nhu'ng giam dyac chi phi mua vat lipu chen, m l cdn gdp phin gial quylt vin de d l thai v l hoin nguydn mdi tryang cho md. Tuy nhien, do kich thypc v l dp cirng ciia d l lan nen de sii' dung l i m vat lieu chen Id, c i n d i u ty diy chuyin thilt b| v l chi phi gia cdng cao, anh huong khdng nhd tai g i l thanh t i n than (dac bipt vdi quy md thii' nghipm cdng nghe).
Xit thai tu' c i c xyang tuyen than cung cd nhirng yu diem ve mat kinh t l nhu doi vol d l thii dao Id. Tuy nhien, k i t qua khao s i t cac b i i xit thai va liy mau p h i n tich trong phdng thi nghipm cho t h i y da xit thii tai md Mao Khe cd CO hpt tir 0 + 12Cmm, h i m lypng set cao (18 + 20%), mIm y l u , d l ba rai khi van chuyin trong dydng Ing va thi cdng khii chen se cd dp kien c l khdng cao, d i p irng thap cac yeu cau lim vat lipu chen.
Trpng khu vyc cd Nha m i y nhiet dien Mao Khe, tryc thudc Tap doan Cdng nghiep Than - Khoing san Viet Nam, duac khinh thinh v l dya vac hoat dpng tir 4/2013, sir dung cdng nghp dot than ting sol tuin hoan hien dai CFB.
Tro xi I I san pham ciia q u i trinh ddt than tai Nhi miy, cd c i u tao tu' c i c chit vd ca khdng chiy cd san trong than vai c i u true d^ng thuy tinh va vd dinh hinh. Tro xi gIm tro bay (bay la iu-ng trong khdi thai v l dypc thu lai nha he thong loc
bui tinh dien) va tro diy. Hien nay, N h i may dang hoat ddng vo'i c i n g s u i t tiSu thy khoing 5000 t i n than mdi ngay va thai ra khoang 2000 tan tro xF/ngly-dem, trong dd, cd khoang 1400 fin tro bay v l 600 tan tro diy. Do tai khu vyc Mpo Kh§
hien tai chya cd nhu cau sii' dgng logi vat lipu n i y nen t o i n bp lyang trp x] tir Nha miy dang dyac thai ra bai thai, den nay, khoi lypng tro xi tren bai thai da d i n h i n g tripu t i n .
Dd danh g i l kha nang sii' dung tro x? cua Nha may lam vat lieu chen Id thiiy lyc, Vien Khoa hoc Cdng nghe Md da khao sat, l i y m l u tai bai thai >
v l t i l n hlnh thi nghiem. K i t qua thi nghiem cho thiy, tro bay cd dp min cao, toi x l p , cd' hgt nho tir 0,5(im d i n lOO^m, tro day cd co hpt Idn hpn trong bay v l nho han 2,5mm. Vdi kich thudc hst m|n nhy trdn, dung d|ch tro bay d l van chuyin trong dyang ong, tuy nhien, vi ca hpt qui nho, khi thi cdng khii chen bing phyang phap thiiy lyc r i t khd t i c h nyac khdi khii chen, do do khdng phii hop de chen id trong Id chp. Tro day cd CO' hpt dyd'l 2,5mm, cd d i e tinh g i n tyang tv nhy c i t sdng, dp t h i m t h i u tit, thpat nudc nhanh va cd dp len chat lan, r i t phii hop vdi phuang phip chen Id thiiy lyc m l khdng can them cdng dopn gia cdng c h l bien. Cung dp v|n tai ttr b i i thai nay d i n v| tri ap dung thir nghidm khong xa, khoang 5,8km. Do dd, lya chpn tro d i y tir Nha m i y nhiet dien Mgo Khe lam vat ll?u chen id cho khu vyc I p dung thii' nghiem la phii hap.
3.2. Tinh toan thiet ke giai phap v$n chuyen vat lieu chen
Tro d i y tU' bai thai N h i m i y nhiet dien Mao Khe duac dya ve mat bing cira Id mirc +25 cua khu vyc thir nghiem bang dtd, cung do van lal 5,8km. Tai diy, tro dypc dya vIp bun ke cap lipu v l dypc van chuyin bang sire nyac theo dudng Ing d i n vj tri c i n chen Id.
Sa do he thong chen Id dypc t h i hipn tren hinh 4.
Cdng suit yeu c i u cua hp thong chen 16 bang: Qc = Kl x K2 x (Vc - Vg)/T = 38,3 m=/gid.
Trong dd: Vo - The tich khii chen mdi tiln dp; Vg - T h i tich gd chong trong khii chen; Kl = Hp s6 khdng diln d i y khoi chen boi v|t lipu chen, K1
= 0,95; Ka - Hp s i d y try tinh den sy khdng dieu hda s i n xuit, K2 = 1,5, T - Thai gian thi cing khii
BuMiet^tei
Hinh 4. Sa dd hS thing chSn Id Chen (kh6ng ke thdi gian chuan bj, thu dpn trudc va sau thi cong), T = 3 gid.
Theo kinh nghipm ap dung chen 16 thuy lyc tai Nga va Ba Lan, ty Ip t h i tich hdn hap vat lieu ch6n ; nude (R:N) thudng n i m trong khoang 1:2 d i n 1:6, tuy thuoc vao tinh chit eua vat lieu, kich thudc v^ thanh phin cd hpt cua vat lieu. Mat kh^c, theo gi^o su Bronikov D.M, ty Ip R N eo t h i dupc tinh toan theo cong thuc:
Trong do: Ls = ZH/ ILn - Ty le gida chieu cao (IH, m) t u tram c l p vat lipu chen d i n vj tri chen 16 vdi cung dp van tai theo phuang ngang ( I U , m) t d tram c l p vat lipu chen den vj tri chen 16 (hlnh 5); As - He s i sdc can trung binh cua hin hgp trong qua trinh di chuyin trong dudng ong.
^ l a „ s m a ) + I ( f f c o s a ) Trong do: phh - Ty trpng trung binh cua h i n hp-p, phh =(Rpr+N)/(R+N), tln/m^; pr - Ty trpng
Hlnh 5. GiSn d6 tinh toSn cSc thdng si he thing (Sifd/ng ing v$n chuyin vSt liSu chSn
tmng thifi diim khd khSn nhit
cua tro day, theo k i t qua thi nghiem eua Vipn Khoa hoc Cong nghp Mo, pr = 2,61 tln/m^; ZL - Tong chilu dai dudng ong van tai; a - Goc doc dudng ong van tai trong tung doan.
T u cac c6ng thue tren, tinh toan dupe ty Ip the tich vat lieu chen va nude, (R:N) la 1:3,75.
O l danh gia sau han v l ty le (R:N) phu hpp khi van tai tro day bang dudng Ing thuy lye trong d i l u kien khu vye ap dung thd nghiem, Vien Khoa hpc Cong nghe Mo da tiln hanh thi nghiem tren mo hinh mo phong sa do dudng Ing van ehuyin vat lieu chen trong dilu kien thye te (c6 dudng kinh ong (J)50 mm, ty le theo chilu dai 1:10), vdi eae ty le (R:N) nam trong dai tu1:1 d i n 1:6. Kit qua thi nghiem cho thiy, tyip (R:N) bang 1:4 la ty le toi uu, dam bao kh6ng gay t i c nghen dudng ong va tilt kiem nudc.
Nhu vay, tong quan kinh nghiem nude ngoai, cac k i t qua tinh toan ly thuyit, thi nghipm thye t l d i u cho thay, de van chuyin vat lieu chen bang dudng Ing thuy lyc, ty Ip t h i tich tro day:
t h i tich nudc (R:N) hp-p ly bing 14.
Tren ca sd da xae dinh cong suat yeu eiu cua hp thing chen 16, va ty le tro day: nudc (R:N) hpp ly, tinh toan dupc luu lupng yeu eiu cua ddng chay h i n hpp trong dudng Ing van tai bing. Qhh = Qe x (R+N).R = 192, m^/gid.
Mat khae, luu lup-ng cua ddng chay hin hpp trong dudng Ing dupc xac djnh theo cong thdc:
Qhh = 3600.V2,TT.D^, m3/gid. Trong d6: vi - V|n tie dong chay khi thoat ra khoi mieng ong, m/s;
D - Dudng kinh Ing van tai vat lieu chen.
Van toe V2 dupc xac djnh dua tren phuang trinh can bang nang lupng Beenoulli tai cac mpt cit 1-1 va 2-2 (hinh 5), co dang thu gpn nhu sau-
TH = ^ + h^
l.g ^ Trong do: £ - He s i thay d i i dong nang tinh d i n sy sai khac gida h i n hpp vat lieu chen va chit long ly tudng, £ = 1,05; g - Gia t i c trpng trudng, g = 9,81 m/s^; hw - T i n that cpt ap ddng chay t u mat c i t 1-1 den mat c i t 2-2.
Ton thit cpt ap hw bao gom t i n thit ma sat doc dudng va ton thit cue bp. Trong do, t i n thit eye bp la khong dang ke, do do, hw co t h i dupc xac djnh theo cong thdc Darcy vdi hp so ton thit doc dudng (A) xac djnh theo thue nghiem cua Nikuratse:
KHCNM S6 10/2014* CNKT HAM L 6
Thong tin khoa hoc cong nghe m o
K, '-
(2.lB^+l,74)'Trpng do. A - Dp nhim tuyet d l l ciia Ing dan, A = 0,1 mm = lO'im.
Duong kinh Ing van tai v l t lieu chen I I nghiem cua phuong trinh:
ZH H,743=DJ
Giai phuang trinh noi tren, nhan duac D = 0,122m = 122mm. Phuang an da lya chpn dudng Ing van tai eo dudng kinh trong D = 150mm la phu hpp.
Ben canh viec xac djnh dudng kinh ong van chuyin vat lieu chen, thilt ke c i n kilm tra van t i c ddng chay trong Ing. Van t i e dong chay c i n Idn han van toe tdi han vkr (la van t i c ddng chay h6n hap khi bat d i u xuat hien hi§n tupng pha r i n tach ra va rai xuing mat dudi Ing, dan den t i c ong), dong thdi van t i c dong chay qua Idn se lam tang hao mdn dudng Ing. Theo Smoldurev A.E, van toe dong chay phu hpp nim trong khoang (1,1^1,5)vkr Van t i e tdi han vkr dupc xac dmh theo cong thdc.
y^r = C'^ffgSD = 3,45 m/s
Trong do: C"- He so kinh nghiem, C"= 8,5-5-9,5;
f - He s i ma sat tong quat cua cac hat pha cung vdi thanh ong, f = 0,5; S - Ning dp pha cung trong dung djch, S = 0,2.
Nhu vay, vdi dudng kinh ong D = 150mm, xac dinh dupc van t i e dong chay h i n hpp trong ong bang v = 5,2 m/s = 1,5 x Vkr, dam bao h i n hpp chen se khong gay t i c dudng Ing, ding thdi han chl dupc su hao mon dudng ong.
3.3. Tinh toan thiet ke giai phap cap, thoat nip&c
Nudc d l van chuyin vat lieu chen dupc c l p tu b l chua tren mat bang +25. Luu lupng c i n thilt trong qua trinh van chuyen vat lieu chen cua mpt tiln dp chen 16 la: Qnu<KjA= 4xQc = 153,2 m^/gid. Ha ap c i n thilt cho sung ban nudc la HsLing 2 10 m. Phuang an da lya chpn may bam CO ma hieu 4x3C-WX (hoac loai co dac tinh tuang duang) de bam cung c l p nudc cho sung bin nudc.
Tren ca sd da xac djnh luu lupng nudc c i n
thiet trong qua trinh chen 16, va bilu d l to chdc chu ky san xuit, tinh toan dupc nhu c i u nudc sd dung d l van chuyin vat lieu chen trung binh trong mot ngay dem bang 1.226 m^/ngay-d^m.
Sau khi chen 16, nudc t u khoi chen thoat ra thupng thoat nudc, chay xuing 16 dpc via mdc -80 va dupc gom ve h i thu nudc. Tai day, sau khi lang dpng, nudc dugc bcm quy h i i trd lai b§
chda d mat bang +25 (hinh 4). Lup-ng nude co the bam quy hoi trd lai b l chda d mat bing +25 dupc xac dinh bang 70% lup'ng nudc sd dyng d l van chuyin vat lieu chen, tuang duang Qqi;, h6i = 858 m^/ngay-dem.
Bam nudc quy h i i dupc tinh toan sao cho co t h i bam h i t nudc thai ra trong mpt ngay dem trong vdng 2 ca san xuat, moi ca lam viec 7 gia.
Do do, luu lupng bam c i n thilt la Qbom.qh s 858/14 = 61,3 m^/gid.
Hp ap c i n thilt cua may bam d l bam nuac tu ho thu nudc mdc -80 len b l chda +25 bang ap lyc cpt ap tmh trong dudng ong (Hi = 105m) cpng vdi t i n t h i t ap s u i t gay ra bdi ma sat cua chit long di chuyin trong dudng Ing (Hms).
Vdi dudng kinh I n g 100mm, chilu dai duong Ing 250m, Hms duac tinh theo cong thtfc Darcy-Weibeck va bang 10m. Nhu vay, ha ap c i n thiet de bam nudc t u h i thu nudc mdc -80 len b l chua tai mat bang +25 la H £ 115m. Ti>
nhdng tinh toan noi tren, Phuang an da lya chpn may bam co ma hieu MD85-45(SL) d l bam quy h i i nudc.
Lupng nudc c i n thiet bo sung vao b l chira tai mat bang +25 la 368 mVngay-dem Lupng nudc nay dup'c l i y t u b l chda nudc cua hai h^
thing xd ly nude thai BOOm^ va 1200m^ tai m?t bang cda 16 +17 cua Cong ty than Mao Khe, qua he thing bam va dudng ong d i n nudc. Sd dung may bam loai co ma hieu Pentax CM50/125A (hoac loai khac co dac tinh tuang duang). €ac tinh ky thuat eua cac may bam sd dung cap, thoat nudc cho khu vyc thu nghiem khai thac chen 16 duac gidi thieu trong bang 1.
4. Tinh toan cac chi tieu KTKT va ting mdc d i u t u
Tren ca sd cae giai phap thiet k l nhu trSn, Phuang an da tinh toan cac chi tieu kinh t l - k?
thuat cua 16 chp* (bang 2) va xac djnh tong mCrc d i u tu cua dy an thu nghiem. Theo do, dy to^n chi phi thue hien thd nghipm cong nghp khoang
Bing 1. Bic tinh kf thudt oiia cdc mdy bam TT
1 2 3 4 5 6
Ten thdng so Lyulypng Ha dp
Cdng suit dpng co di$n Hi^u suit
Tic dd vdng quay Khii lypng
Damvi m^/gid m kW Vdng/phut
%
Kg
MS hi&u mdy bam 4X3C-WX
86,4-198 9-52
30 59-71 1000-2200
236
MD85-45(SL) 56-100 117-153
65 63-70
2950 224
Pentax CM50/126A 15-72 16,5-26
5,7
- -
50
BSng 2. BSng chi tidu kinh ti kp thuSt ca bSn cua apng vao khai thae thd nghiem chi 100.000 t i n , id chqf thiit ki n^n gia thanh tieu thu theo tinh toan eua Phuang
an kha cao. Khi cong nghe thd nghipm thanh cong, viee md rong ap dung cho cac khu vuc khac tpi canh Nam, mo Mao Khe ndi rieng, cac khu vuc dudi cong trinh, d i i tupng ein bao vp tai cac md h i m 16 vung Quang Ninh noi chung, se CO suit d i u t u thap han do kha nang huy dpng dupc tru lugng than Idn han vao khai thac, keo theo d6 la gia thanh san phim se giam xuing dang ke.
5. K i t luan
Kit qua tinh toan eua Phuang an ap dyng thu nghiem cong nghe khai thac dilu khien da vach bing chen 16 nhim bao vp cac cong trinh b l mpt tai khu vyc canh Nam, mo than Mpo Khe cho thiy, day la cdng nghe c6 tinh kha thi, co kha nang giam thilu toi da anh hudng eua khai thdc d i n cac eong trinh tren be mat. Vipc ap dyng thd nghiem thanh cong cac giai phap ky thupt eong nghe se cho phep huy dpng t i i da nguIn tai nguyen than vao khai thae, keo dai tuli thp mo, giam chi phi suit dau t u ca ban va nang eao hipu qua san xuit kinh doanh cho doanh nghipp, ding thdi phue vu cae nhu c i u cua nen kinh t l quic dan./.
Tai lieu tham khao:
1. "Phuung an ap dung thie nghiim cong ngh$
khai thac dieu khien da vach bSng chen 16 nhim bao vp cac cdng trinh be m$t tai khu vuc canh Nam mo than Mao Khe - TKV". Vien Khoa hpc C6ng 44.7 ty ding. Trong do. mpt phin Idn chi phi d i u "ghe Mo - Vinacomin. 2014.
tu cho c6ng trinh khai thong dao b l sung la 2. BPOHHMKOB fl.M. «3aKnado^Hbie pa6ombi e thugng dd -80/LV vd cac cong trinh phy trg. nhu: ujaxmax», MocKsa - Heflpa, 1989.
trpm c l p v^t lipu ch6n tren mpt bing +25, hp 3.CMonAbipeBA.E. «Tpy6onpoeodHbiu mpaHC- thlng v^n chuyin v^t lipu ch6n, h i thu nudc va nopm KOHiteHmpupoeaHHbix zudpocMeceu», h$ thing c l p , thodt nudc. Do trd lugng huy MocKsa - MaiuHHOCTpoeHMe, 1973.
7T 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Ten chi tieu Chieu day via trung binh
Gdc ddc via trung binh Chl^u ddi theo phyong edt khai thic S6 lypng guong khiu Tiln dd 1 chu ky Sin lypng 1 chu ky Sd ca hodn thdnh 1 chu ky
s i n lypng 1 ngiy dfim Cdng suit Id chp Sd cdng nhan iam vide 1 ngay ddm Ndng suit lao dpng tryc tilp
Chl phi thudc nd cho 1000 tin than Chl phi kip nd cho 1000 tin than
Chi phi gd cho 1000 tin than
Chi phi mdt 16 chuin bi cho 1000 tin than Chl phi v|t li$u chpn cho 1000 tin than Chi phi nudc cho 1000 tin than
Ty Id tin thit than
Bam vi m dd m gyang
m Tin ca Tin Tin/nam
ngydi tln/cdng
kg kip m3 m m3 mS
%
Khai luvng 6,9 68 120
2 6 291
4 109 32 000
72 1,51 165,1 825,5 72,0 7,6 526,4 631,7 21%
KHCNM SO 10/2014* ( NkT HAM l.O
